Collection location: Jackson Demonstration State Forest, Mendocino Co., California, USA [Click for map]
These were growing among mixed conifers and the caps were up to 8.5 cm across and appeared to be slightly tacky.
Spores were ~ 8.0-9.9 X 5.9-6.3 microns and sl. to mod. rough.
KOH on the cap gave a light brown reaction at most and basically neg on all other surfaces.
They look pretty close to the C. biformis on Mushroom Hobby.
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I agree that these are in the C. biformis clade. A bit more blue on the stem would have been more typical, but the overall stature is there. This is very complex clade, a cluster of species. There is also Cortinarius subpurpureus A.H. Sm., a name that is commonly used up North for one of the variants, which we also have in SPSP. In fact looking at my photo of C. subpurpureus, you can use that name too. But again, the group is complex.